Major Land Resource Area 034A

Cool Central Desertic Basins and Plateaus

Accessed: 12/28/2024

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Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin

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Ecological site group list

Provisional

034AESG07

Outcrops
i
Key Characteristics
1. >75% bedrock outcrop
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Provisional

034AESG08

Riparian
i
Key Characteristics
1. <75% bedrock outcrop
2. Perennial water
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Provisional

034AESG12(17484)

Semiarid Cool Sandy Bottoms

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Provisional

034AESG16

Arid Cool Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Ephemeral water
5. Subsurface EC <4
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Provisional

034AESG17

Arid Cool Clay Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock <30% surface and <30% subsurface
11. Clay >30% surface or >35% subsurface
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Provisional

034AESG18

Arid Cool Deep Rocky
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock >30% surface or >30% subsurface
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Provisional

034AESG19

Arid Cool Finer Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock <30% surface and <30% subsurface
11. Clay <30% surface and <35% subsurface
12. Sand <75% or texture is sandy loam or finer in surface & subsurface
13. Clay >20% or texture is finer than sandy loam in surface
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Provisional

034AESG20

Arid Cool Gypsum
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum >5% surface or >10% subsurface
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Provisional

034AESG21

Arid Cool Loamy Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock <30% surface and <30% subsurface
11. Clay <30% surface and <35% subsurface
12. Sand <75% or texture is sandy loam or finer in surface & subsurface
13. Clay <20% or texture is sandy loam or sandier in surface
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Provisional

034AESG22

Arid Cool Saline Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Ephemeral water
5. Subsurface EC >4
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Provisional

034AESG23

Arid Cool Saline Hills
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR >8
6. <75% bedrock outcrop
7. Ephemeral water or uplands
8. Aridic moisture regime
9. Uplands
10. Surface SAR <8
11. Gypsum <5% surface and <10% subsurface
12. Subsurface EC >8 or surface EC >4
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Provisional

034AESG24

Arid Cool Saline Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC >1.5 surface or >2 subsurface
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Provisional

034AESG25

Arid Cool Sandy Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock <30% surface and <30% subsurface
11. Clay <30% surface and <35% subsurface
12. Sand >75% or texture is loamy sand or sandier in surface & subsurface
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Provisional

034AESG26

Arid Cool Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth: 30-55cm
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Provisional

034AESG27

Arid Cool Very Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth <30cm
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Provisional

034AESG28

Semiarid Cool Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Ephemeral water
5. Subsurface EC <4
6. Sand <50% or clay >25% for surface and subsurface
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Provisional

034AESG29

Semiarid Cool Clay Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock <30% surface and <30% subsurface
11. Clay >30% surface or >35% subsurface
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Provisional

034AESG30

Semiarid Cool Deep Rocky
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth >55cm
10. Rock >30% surface or >30% subsurface
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Provisional

034AESG31

Semiarid Cool Gypsum
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum >5% surface or >10% subsurface
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Provisional

034AESG32

Semiarid Cool Saline Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Ephemeral water
5. Subsurface EC >4
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Provisional

034AESG33

Semiarid Cool Saline Hills
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR >8
6. <75% bedrock outcrop
7. Ephemeral water or uplands
8. Udic, ustic, and xeric moisture regimes
9. Uplands
10. Surface SAR <8
11. Gypsum <5% surface and <10% subsurface
12. Subsurface EC >8 or surface EC >4
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Provisional

034AESG34

Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC >1.5 surface or >2 subsurface
9. <75% bedrock outcrop
10. Ephemeral water or uplands
11. Udic, ustic, and xeric moisture regimes
12. Uplands
13. Surface SAR <8
14. Gypsum <5% surface and <10% subsurface
15. Subsurface EC <8 and surface EC <4
16. EC <1.5 surface and <2 subsurface
17. Depth >55cm
18. Rock <30% surface and <30% subsurface
19. Clay <30% surface or <35% subsurface
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Provisional

034AESG35

Semiarid Cool Sandy Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Ephemeral water
5. Subsurface EC <4
6. Sand >50% & clay <25% for surface and subsurface
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Provisional

034AESG36

Semiarid Cool Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth: 30-55cm
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Provisional

034AESG37

Semiarid Cool Very Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Udic, ustic, and xeric moisture regimes
4. Uplands
5. Surface SAR <8
6. Gypsum <5% surface and <10% subsurface
7. Subsurface EC <8 and surface EC <4
8. EC <1.5 surface and <2 subsurface
9. Depth <30cm
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Ecological site group keys

MLRA 34A

I. >75% bedrock outcrop ... 034AESG07 – Outcrops

II. <75% bedrock outcrop

A. Perennial water ... 034AESG08 – Riparian

B. Ephemeral water or uplands

1 Aridic moisture regime

i. Ephemeral water

a. Subsurface EC >4 ... 034AESG22 – Arid Cool Saline Bottoms

b. Subsurface EC <4 ... 034AESG16 – Arid Cool Bottoms

ii. Uplands

a. Surface SAR >8 ... 034AESG23 – Arid Cool Saline Hills

b. Surface SAR <8

1) Gypsum >5% surface or >10% subsurface ... 034AESG20 – Arid Cool Gypsum

2) Gypsum <5% surface and <10% subsurface

a) Subsurface EC >8 or surface EC >4 ... 034AESG23 – Arid Cool Saline Hills

b) Subsurface EC <8 and surface EC <4

(1) EC >1.5 surface or >2 subsurface ... 034AESG24 – Arid Cool Saline Uplands

(2) EC <1.5 surface and <2 subsurface

(a) Depth <30cm ... 034AESG27 – Arid Cool Very Shallow

(b) Depth: 30-55cm ... 034AESG26 – Arid Cool Shallow

(1) Rock >30% surface or >30% subsurface ... 034AESG18 – Arid Cool Deep Rocky

(2) Rock <30% surface and <30% subsurface

(a) Clay >30% surface or >35% subsurface ... 034AESG17 – Arid Cool Clay Uplands

(b) Clay <30% surface and <35% subsurface

(1) Sand >75% or texture is loamy sand or sandier in surface & subsurface ... 034AESG25 – Arid Cool Sandy Uplands

(2) Sand <75% or texture is sandy loam or finer in surface & subsurface

(a) Clay <20% or texture is sandy loam or sandier in surface ... 034AESG21 – Arid Cool Loamy Uplands

(b) Clay >20% or texture is finer than sandy loam in surface ... 034AESG19 – Arid Cool Finer Uplands

2 Udic, ustic, and xeric moisture regimes

i. Ephemeral water

a. Subsurface EC >4 ... 034AESG32 – Semiarid Cool Saline Bottoms

b. Subsurface EC <4

1) Sand >50% & clay <25% for surface and subsurface ... 034AESG35 – Semiarid Cool Sandy Bottoms

2) Sand <50% or clay >25% for surface and subsurface ... 034AESG28 – Semiarid Cool Bottoms

ii. Uplands

a. Surface SAR >8 ... 034AESG33 – Semiarid Cool Saline Hills

b. Surface SAR <8

1) Gypsum >5% surface or >10% subsurface ... 034AESG31 – Semiarid Cool Gypsum

2) Gypsum <5% surface and <10% subsurface

a) Subsurface EC >8 or surface EC >4 ... 034AESG33 – Semiarid Cool Saline Hills

b) Subsurface EC <8 and surface EC <4

(1) EC >1.5 surface or >2 subsurface ... 034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands

(2) EC <1.5 surface and <2 subsurface

(a) Depth <30cm ... 034AESG37 – Semiarid Cool Very Shallow

(b) Depth: 30-55cm ... 034AESG36 – Semiarid Cool Shallow

(1) Rock >30% surface or >30% subsurface ... 034AESG30 – Semiarid Cool Deep Rocky

(2) Rock <30% surface and <30% subsurface

(a) Clay >30% surface or >35% subsurface ... 034AESG29 – Semiarid Cool Clay Uplands

(b) Clay <30% surface or <35% subsurface ... 034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands

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